code: def decode(self, encoded):
      _Tracker().decode_called = True
      return super().decode(encoded)
  
file_path: data-validation/tensorflow_data_validation/types_test.py
imports: from absl.testing import absltest
  import apache_beam
  from apache_beam.testing import util
  import pyarrow
  from tensorflow_data_validation import types
label_desc: Use image node_id 2 for calling the _TrackedCoder obj's underlying member method code with example usage: obj.decode(encoded) and returns: super